CALCINED MAGNESIUM OXIDE Russian patent published in 2000 - IPC

FIELD: refractory materials. SUBSTANCE: calcined magnesium oxide useful in refractory materials production and in other applications can be prepared by calcination of magnesite and contains, wt % : activated magnesium oxide (periclase) up to 10.0, magnesite up to 12.0, dolomitized magnesite up to 6.0, silicates up to 2.0, and has following grain composition, wt % : > 4 mm up to 5.0, <0.5 mm up to 70.0, 0.5-4 mm - the balance. Open porosity of material is more than 35%, specific surface 30-60 sq.m.g, crystalline lattice defect factor 1.1-1.7. Material contains following trace minerals, limiting wt %: chromium 0.015, arsenic 0.005, cadmium 0.0005, mercury 0.0003, lead 0.01, strontium 0.0001. EFFECT: increased absorption capacity and catalytic activity and reduced agglomeration tendency. 3 cl, 3 tbl